ColdFusion/CFML. All day, every day. Although a heavy dose of the newer hotness and the eventual migration of everything I work with off of it is in the works. Still enjoy working with it though. Very productive.
ECMAscript style coding support that unlocked the underlying JVM in its entirety is one of those things.
It was one of the first, and only languages and platforms that was made for the web first, instead of extending non-web language to the web with a framework.
I am working on a new project in Django that is going to be interesting, so we'll see how that pans out.
I'm working on the latest revision of a client's CF intranet app that been in use for fifteen years, now.